How to Repair Corrugated Roof Flashing

What You'll Need
Screws or nails
Replacement sheeting

Corrugated roof flashing has long been used in American homes, outhouses, and industrial buildings. The corrugated roof does not have to be unappealing, but you may find that with age it can start to look worn, or even peel away at the edges. This needs to be fixed quickly before water can penetrate into the attic area of the roof.

Repairing a corrugated roof flashing can be daunting, but you should be able to manage this without too much difficulty. If you have some basic home improvement skills and follow a few simple guidelines you can get the job done quickly and easily.

Step 1 – Assessing the Problem

The first step is to examine the extent of the damage to your roof. You will probably need to use a large ladder in order to assess the amount of repair you will need to do. A simple tear in the sheet, or perhaps some buckling, can easily be repaired by a home improvement fan, but if the problem is more serious, for example the wood below is rotting or has become displaced, then you will need to call in a professional. Assuming that the problem is manageable, you can remove the sheet which has been damaged.

Step 2 – Repair the Sheet

Decide whether to repair or replace the sheet. If it is just a split, you can fix the two halves of the old sheet together using roofing tape and a layer of caulk. Fix the sheets together on the ground, and then use a layer of caulk over the underside of the sheet, taking care to cover all the edges of the tape, and the sides of the old sheet.  Leave to dry.

Step 3 – Replace the Sheet

Take your new or repaired sheet and stand at the highest level of the ladder required to reach the roof. Line up your corrugated sheet so there is a slight lip at the bottom of the roof. Then nail your two corner pieces into place. You may choose to use screws instead.

Step 4 – Finishing

Before you finish the project you will have to add more roofing tape and caulk to the repaired sheet. Take your tape, and press it against the top edge of the sheet, and press the tape so that it touches the previous corrugated iron. Then seal firmly all the way around your new sheet. Add a layer of caulking around the edges of the tape, and, if you repaired a crack using tape, caulk around the outside edge of this crack too. This will help to prevent the tape from peeling, and also reduce the likelihood that moisture will enter the flashing by forcing itself under the sides of the tape. Leave to dry.